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Spraying gun

A technology of spray guns and nozzles, which is applied in the field of hydraulic spray tools and spray guns, and can solve the problems of spray gun body backsplash damage, poor anti-splash ability, spray gun body damage, etc., to achieve strong anti-splash ability and avoid being stabbed , long service life effect

Inactive Publication Date: 2020-08-11
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nozzle is welded to the gun body and cannot be replaced
In addition, in the process of hydraulic jet fracturing construction, the problem of backsplash and puncture of the spray gun body widely occurs
The main reason for the damage of the spray gun body is that the high-speed jet stream formed by the acceleration of the sand-containing perforating fluid through the nozzle hits the inner wall of the wellbore casing, and then splashes back and impacts the injector (spray gun) body. Poor backsplash ability, which can easily cause the spray gun body to be punctured

Method used

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  • Spraying gun
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] like figure 1 As shown, in this embodiment, the spray gun mainly includes a spray gun body 1 , a fixed joint 2 , an upper inner tube 3 , a superhard coating 41 , a lower inner tube 5 , a nozzle 6 , and a lower joint 7 . The spray gun body 1 has a stepped hole for assembling the nozzle 6. The end of the stepped hole near the inner wall of the spray gun body 1 is a large diameter end, and the end near the outer wall of the spray gun body 1 is a small diameter end; the middle part of the nozzle 6 is formed with holes for In order to realize the communication between the inner cavity of the spray gun body 1 and the outside, a boss is also formed in the middle of the outer wall of the nozzle 6, wherein the part of the nozzle above the boss is matched and inserted in the small diameter end of the stepped hole, and the boss is matched and inserted in the stepped hole. In the large-diameter end of the hole; the upper inner tube 3 and the lower inner tube 5 are coaxially inserte...

Embodiment 2

[0038] like figure 2 As shown, the difference between the second embodiment and the first embodiment is that the superhard coating 41 is replaced by a superhard alloy cylinder 42 and a stopper 8 .

[0039] In this embodiment, turning is performed on the side of the outer wall of the spray gun body 1 close to the lower joint 7, and a step is turned in the middle of the outer wall of the spray gun body 1, and the superhard alloy barrel 41 is matched with the turning surface of the spray gun body 1. On the surface, and one end of the superhard alloy cylinder 41 is on the step; the stopper 8 is a ring structure and it is matched with the end of the turning surface of the spray gun body 1, and is supported on the other end of the superhard alloy cylinder 41, To tighten the superhard alloy cylinder 41 on the step to realize the limited assembly of the superhard alloy cylinder 41 and the spray gun body 1, wherein the stopper 8 and the spray gun body 1 are connected by threads or fix...

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Abstract

The invention discloses a spraying gun which comprises a spraying gun body, a nozzle, an upper inner pipe, a lower inner pipe, a fixing joint and a lower joint. A stepped hole is formed in the spraying gun body for assembling the nozzle. Hardening treatment is further adopted on the outer wall of the spraying gun body. A boss is formed at the middle of the outer wall of the nozzle, and the boss isclamped into the stepped hole. The upper inner pipe and the lower inner pipe are coaxially inserted into an inner cavity of the spraying gun body, and the upper inner pipe and the lower inner pipe are spliced and then form a round hole. The round hole is matched with the lower portion of the nozzle so that the nozzle can be limited into the stepped hole. The fixing joint and the lower joint are installed at the two ends of the inner cavity of the spraying gun body so that the upper inner pipe and the lower inner pipe can be limited into the inner cavity of the spraying gun body. A hydraulic injection tool can be repeatedly used after a worker descends a well one time, and the nozzle can be rapidly replaced at a well site, so that the fracture construction efficiency can be improved, and the overall operation time can be shortened.

Description

technical field [0001] The invention belongs to the field of well completion engineering of unconventional oil and gas reservoirs such as petroleum and natural gas, and relates to a hydraulic injection tool, in particular to a spray gun. Background technique [0002] When oil and gas wells connect the formation and the wellbore through sandblasting perforation, hydraulic jet tools are used. Currently, there are two main installation forms for the nozzles of hydraulic jet tools, one is threaded connection and the other is welding. The threaded connection is secured by screwing from the outside of the gun, which makes it possible for the nozzle to come off during blasting and perforating due to the high rate of blasting. The nozzle is welded to the gun body and cannot be replaced. In addition, in the process of hydraulic jet fracturing construction, the problem of backsplash and puncture of the spray gun body widely occurs. The main reason for the damage of the spray gun bod...

Claims

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Application Information

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IPC IPC(8): E21B43/114E21B43/119
CPCE21B43/114E21B43/119
Inventor 刘志斌李梅杨晓勇冯强詹鸿运郭鸣秦诗涛李世恒吕双张华
Owner CNPC BOHAI DRILLING ENG
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